/* learn.itowin.io — brand per DESIGN.md: indigo #0B003C, green #1EA43F, white; Montserrat 300–700 self-hosted. */
@font-face{font-family:Montserrat;font-weight:300;font-display:swap;src:url(fonts/Montserrat-300.ttf)}
@font-face{font-family:Montserrat;font-weight:400;font-display:swap;src:url(fonts/Montserrat-400.ttf)}
@font-face{font-family:Montserrat;font-weight:500;font-display:swap;src:url(fonts/Montserrat-500.ttf)}
@font-face{font-family:Montserrat;font-weight:600;font-display:swap;src:url(fonts/Montserrat-600.ttf)}
@font-face{font-family:Montserrat;font-weight:700;font-display:swap;src:url(fonts/Montserrat-700.ttf)}

:root{--ind:#0B003C;--ind2:#1B2655;--grn:#1EA43F;--wht:#fff;
  --bg:#fff;--ink:#0B003C;--mut:#5a5878;--line:#e3e2ee;--card:#fff;--card2:#F2F2F2;--hover:#F2F2F2;--link:#0B003C;--focus:#1EA43F}
[data-look=dark]{--bg:#0B003C;--ink:#fff;--mut:#c9c6e6;--line:#2a2566;--card:#1B2655;--card2:#241f5e;--hover:#241f5e;--link:#fff}
@media (prefers-color-scheme: dark){[data-look=auto]{--bg:#0B003C;--ink:#fff;--mut:#c9c6e6;--line:#2a2566;--card:#1B2655;--card2:#241f5e;--hover:#241f5e;--link:#fff}}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 Montserrat,system-ui,sans-serif}
a{color:var(--link)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px;top:8px;background:var(--grn);color:#fff;padding:8px 12px;border-radius:6px;z-index:9}
.skip:focus{left:16px}

/* header: always indigo, the wordmark is approved for dark backgrounds only */
header.top{background:var(--ind);color:#fff;position:relative;overflow:hidden}
header.top:after{content:"";position:absolute;right:-56px;top:-70px;width:150px;height:150px;border-radius:26px;background:var(--grn);transform:rotate(45deg);opacity:.9}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px;position:relative;z-index:1}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:#fff;min-width:0}
.brand img{width:133px;height:32px;display:block}
.brand span{font-weight:500;font-size:15px;letter-spacing:.02em;border-left:1px solid rgba(255,255,255,.35);padding-left:14px;white-space:nowrap}
.tools{display:flex;align-items:center;gap:10px}
.lang{display:flex;gap:2px;font-weight:600;font-size:13px}
.theme{background:none;border:1px solid rgba(255,255,255,.35);color:#fff;border-radius:8px;width:32px;height:32px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;padding:0}
.theme:hover{background:rgba(255,255,255,.12)}
.theme svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.theme .sun{display:none}
[data-look=dark] .theme .sun{display:block}[data-look=dark] .theme .moon{display:none}
@media (prefers-color-scheme: dark){[data-look=auto] .theme .sun{display:block}[data-look=auto] .theme .moon{display:none}}
.lang a{color:#fff;text-decoration:none;padding:6px 10px;border-radius:8px;opacity:.75}
.lang a[aria-current]{background:var(--grn);opacity:1}
.lang.inhead a:not([aria-current]):hover{background:rgba(255,255,255,.12);opacity:1}
[data-switch=title] .lang.inhead{display:none}
[data-switch=header] .lang.intitle{display:none}
.lang.intitle{margin:-6px 0 14px}
.lang.intitle a{color:var(--ink);border:1px solid var(--line)}
.lang.intitle a[aria-current]{color:#fff;border-color:var(--grn)}

.crumbs{font-size:14px;color:var(--mut);padding-top:14px}
.crumbs a{color:var(--mut)}
h1{font-weight:500;font-size:34px;line-height:1.2;margin:14px 0 10px;letter-spacing:-.01em}
h2.section{font-weight:600;font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:var(--grn);margin:26px 0 10px}
.lead{font-size:18px;font-weight:300;color:var(--mut);margin:0 0 8px;max-width:720px}
.meta{color:var(--mut);font-size:14px;margin:0 0 12px}
.notice{border-left:4px solid var(--grn);background:var(--card2);padding:10px 14px;border-radius:0 8px 8px 0;margin:0 0 18px;font-size:15px}

/* home and module lists */
ul.cards,ol.tuts{list-style:none;margin:0;padding:0;display:grid;gap:12px}
ul.cards{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
ul.cards a,ol.tuts a{display:block;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;text-decoration:none;color:var(--ink);min-width:0}
ul.cards a:hover,ol.tuts a:hover{border-color:var(--grn);background:var(--hover)}
ul.cards b{display:block;font-weight:600;font-size:19px;margin-bottom:4px}
ul.cards span{display:block;color:var(--mut);font-size:15px}
ul.cards em{display:inline-block;font-style:normal;font-size:13px;font-weight:600;color:var(--grn);margin-top:10px}
ol.tuts a{display:grid;grid-template-columns:34px minmax(0,1fr) auto;gap:12px;align-items:center}
ol.tuts i,.steps b i{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:7px;background:var(--grn);color:#fff;font-style:normal;font-weight:700;font-size:13px;transform:rotate(45deg);flex:none}
ol.tuts i>*,.steps b i>*{transform:rotate(-45deg)}
ol.tuts b{font-weight:600;font-size:17px}
ol.tuts span{color:var(--mut);font-size:14px;white-space:nowrap}

/* tutorial page */
.tut{display:grid;gap:24px;grid-template-columns:minmax(0,1fr)}
@media (min-width:900px){[data-layout=beside] .tut{grid-template-columns:minmax(0,3fr) minmax(0,2fr);align-items:start}
  [data-layout=beside] .video{position:sticky;top:12px}}
.video video,.video .yt{width:100%;aspect-ratio:16/9;background:#000;border-radius:10px;display:block}
.video .yt iframe{width:100%;height:100%;border:0;border-radius:10px}
.ytlink{font-size:14px;margin:8px 0 0}
.steps h2.section{margin-top:0}
.hint{color:var(--mut);font-size:13px;margin:0 0 10px}
.steps ol{list-style:none;margin:0;padding:0}
.steps li{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;padding:10px 8px;border-top:1px solid var(--line);border-radius:8px}
.steps li.now{background:var(--card2)}
.steps b{display:flex;align-items:center;gap:10px;font-weight:600;font-size:16px;margin-bottom:2px}
.steps b i{width:24px;height:24px;font-size:12px;border-radius:6px;margin:0 4px}
.steps span{display:block;color:var(--mut);font-size:15px}
button.t{font:600 13px/1 Montserrat,sans-serif;font-variant-numeric:tabular-nums;color:var(--ind);background:#fff;border:1.5px solid var(--grn);border-radius:999px;padding:7px 10px;cursor:pointer;height:30px;margin-top:2px;min-width:52px}
button.t:hover,.steps li.now button.t{background:var(--grn);color:#fff}

.pager{display:flex;justify-content:space-between;gap:12px;margin:28px 0 8px}
.pager a{flex:1;max-width:48%;text-decoration:none;color:var(--ink);border:1px solid var(--line);border-radius:12px;padding:12px 16px;background:var(--card);font-weight:600}
.pager a:hover{border-color:var(--grn);background:var(--hover)}
.pager a small{display:block;font-weight:500;color:var(--grn);font-size:12px;text-transform:uppercase;letter-spacing:.06em}
.pager .next{text-align:right;margin-left:auto}
.back{font-size:14px;margin:0 0 30px}
footer{color:var(--mut);font-size:13px;padding:26px 16px 30px;border-top:1px solid var(--line);margin-top:24px}
footer a{color:var(--mut)}

/* root language chooser */
body.chooser{background:var(--ind);color:#fff;min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center}
body.chooser .mark{width:266px;height:64px;max-width:80vw;height:auto}
body.chooser h1{font-weight:300;font-size:36px;color:var(--grn);margin:26px 0 8px}
body.chooser h1 span{display:block;font-size:22px;color:#fff;font-weight:300;margin-top:6px}
body.chooser .lead{color:#c9c6e6;margin:0 auto 22px}
body.chooser .pick{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
body.chooser .pick a{background:var(--grn);color:#fff;text-decoration:none;font-weight:600;padding:14px 28px;border-radius:12px;font-size:18px;min-width:180px}

@media (max-width:600px){
  .brand img{width:116px;height:28px}
  h1{font-size:26px}
  .lead{font-size:16px}
  ol.tuts span{white-space:normal}
  ol.tuts a{grid-template-columns:34px minmax(0,1fr)}
  ol.tuts span{grid-column:2}
  .pager{flex-direction:column}
  .pager a{max-width:none}
  .pager .next{text-align:left}
}